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Modified NOLM for Stable and Improved 2R Operation at Ultra-High Bit Rates
Shin ARAHIRA Hitoshi MURAI Yoh OGAWA
Publication
IEICE TRANSACTIONS on Communications
Vol.E89-B
No.12
pp.3296-3305 Publication Date: 2006/12/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.12.3296 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Fiber-Optic Transmission for Communications Keyword: all-optical signal processing, 2R regeneration, OTDM systems, optical nonlinearities in optical fiber, sagnac interferometer,
Full Text: PDF(870.4KB)>>
Summary:
A nonlinear optical fiber loop mirror (NOLM) adapted for all-optical 2R operation at ultrahigh bit-rates was experimentally and theoretically investigated. The proposed NOLM was created by adding inline/external fiber polarizers and also an inline optical phase-bias compensator (OPBC) to a standard NOLM. A theoretical investigation revealed that the operation of the standard NOLM became unstable due to residual polarization crosstalk of the polarization-maintaining optical components making up the NOLM, and that it could be dramatically improved with the inline/external polarizers. The NOLM with the polarizers ensured stable switching operation with high switching-dynamic-range (>30 dB) against the change of the wavelength of the input clock pulses, and the change of the environment temperature. We also experimentally verified that the OPBC played a dramatic role to ensure excellent dynamic switching performance of the NOLM, and to achieve signal-Q-recovery of the regenerated signals. All optical 2R experiments at 40 Gb/s and 160 Gb/s were performed with the modified NOLM. Signal regeneration with improved extinction ratio and signal Q value was successfully demonstrated. Q-recovery to the input of the control pulses degraded with ASE noise accumulation was also successfully achieved.
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